sh: tmu: Zap get_tbclk and timer_read_counter

Replace those two functions with generic ones by defining the
timer macros in include/config/*.h .

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
diff --git a/include/configs/armadillo-800eva.h b/include/configs/armadillo-800eva.h
index b17d597..3c6b2c3 100644
--- a/include/configs/armadillo-800eva.h
+++ b/include/configs/armadillo-800eva.h
@@ -18,6 +18,9 @@
 
 #define CONFIG_ARCH_CPU_INIT
 #define CONFIG_TMU_TIMER
+#define CONFIG_SYS_TIMER_COUNTS_DOWN
+#define CONFIG_SYS_TIMER_COUNTER	(TMU_BASE + 0xc)	/* TCNT0 */
+#define CONFIG_SYS_TIMER_RATE		(CONFIG_SYS_CLK_FREQ / 4)
 #define CONFIG_SYS_DCACHE_OFF
 
 /* STACK */